Update Wasmer-WASI types with wit-bindgen bindings

[syrusakbary]

Once #2911 is done, we should update Wasmer-WASI with those bindings

[syrusakbary]

This implies removing the wasi-types crate and using the autogenerated types from wit-bindgen

https://github.com/wasmerio/wasmer/tree/master/lib/wasi-types/src

[syrusakbary]

Here's the old witx format, that we may need to update to newest format:
https://github.com/WebAssembly/WASI/tree/main/phases/old/snapshot_0/witx

Note that WITX has splitted into different proposals, and most of the functions preserve the same signature:

• https://github.com/WebAssembly/wasi-filesystem
• https://github.com/WebAssembly/wasi-io
• https://github.com/WebAssembly/wasi-random

[syrusakbary]

It might be good to double check the types with: https://github.com/sunfishcode/preview1.wasm/tree/main/wit

[syrusakbary]

This issue should be fixed by #3177